Induction motor control system

Details Induction motor control system Induction motor control system

1980-04-17

1982-01-12

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, 318809, 318812, H02P 534, H02P 742

Patent

active

043107915

ABSTRACT:
A variable frequency power supply device supplies an AC power to a squirrel-cage motor through an AC parameter control. The control receives a command active current resulting from a command torque and a command exciting current to generate a resultant current and its phase. The command torque is produced from the actual and command motor speeds and the exciting current is caused from the actual motor speed. The control also receives a command frequency determined by the actual motor frequency and a command slip frequency also resulting from the command torque. The control controls the firing phases of thyristors in the power supply device in response to the command current, phase and frequency. The control may generate a voltage for supplying the active current and an exciting voltage to similarly control the firing phases of the thyristors. In the latter case, the exciting voltage may be added with its differential to compensate for a rapid change in active current.

REFERENCES:
patent: 3700986 (1972-10-01), Cushman et al.

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